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501 lines
17 KiB
501 lines
17 KiB
// Copyright 2016 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package core
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import (
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"bytes"
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"errors"
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"math"
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"math/big"
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"sort"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/rlp"
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"github.com/harmony-one/harmony/block"
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"github.com/harmony-one/harmony/core/types"
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"github.com/harmony-one/harmony/core/vm"
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"github.com/harmony-one/harmony/internal/params"
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"github.com/harmony-one/harmony/internal/utils"
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"github.com/harmony-one/harmony/shard"
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staking "github.com/harmony-one/harmony/staking"
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stakingTypes "github.com/harmony-one/harmony/staking/types"
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)
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// ChainContext supports retrieving headers and consensus parameters from the
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// current blockchain to be used during transaction processing.
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type ChainContext interface {
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// GetHeader returns the hash corresponding to their hash.
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GetHeader(common.Hash, uint64) *block.Header
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// ReadDelegationsByDelegator returns the validators list of a delegator
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ReadDelegationsByDelegator(common.Address) (stakingTypes.DelegationIndexes, error)
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// ReadDelegationsByDelegatorAt reads the addresses of validators delegated by a delegator at a given block
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ReadDelegationsByDelegatorAt(delegator common.Address, blockNum *big.Int) (m stakingTypes.DelegationIndexes, err error)
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// ReadValidatorSnapshot returns the snapshot of validator at the beginning of current epoch.
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ReadValidatorSnapshot(common.Address) (*stakingTypes.ValidatorSnapshot, error)
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// ReadValidatorList returns the list of all validators
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ReadValidatorList() ([]common.Address, error)
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// Config returns chain config
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Config() *params.ChainConfig
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ShardID() uint32 // this is implemented by blockchain.go already
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}
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// NewEVMContext creates a new context for use in the EVM.
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func NewEVMContext(msg Message, header *block.Header, chain ChainContext, author *common.Address) vm.Context {
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// If we don't have an explicit author (i.e. not mining), extract from the header
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var beneficiary common.Address
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if author == nil {
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beneficiary = common.Address{} // Ignore error, we're past header validation
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} else {
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beneficiary = *author
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}
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vrf := common.Hash{}
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if len(header.Vrf()) >= 32 {
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vrfAndProof := header.Vrf()
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copy(vrf[:], vrfAndProof[:32])
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}
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return vm.Context{
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CanTransfer: CanTransfer,
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Transfer: Transfer,
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GetHash: GetHashFn(header, chain),
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GetVRF: GetVRFFn(header, chain),
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IsValidator: IsValidator,
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Origin: msg.From(),
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GasPrice: new(big.Int).Set(msg.GasPrice()),
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Coinbase: beneficiary,
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GasLimit: header.GasLimit(),
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BlockNumber: header.Number(),
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EpochNumber: header.Epoch(),
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Time: header.Time(),
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VRF: vrf,
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TxType: 0,
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CreateValidator: CreateValidatorFn(header, chain),
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EditValidator: EditValidatorFn(header, chain),
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Delegate: DelegateFn(header, chain),
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Undelegate: UndelegateFn(header, chain),
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CollectRewards: CollectRewardsFn(header, chain),
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CalculateMigrationGas: CalculateMigrationGasFn(chain),
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ShardID: chain.ShardID(),
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NumShards: shard.Schedule.InstanceForEpoch(header.Epoch()).NumShards(),
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}
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}
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// HandleStakeMsgFn returns a function which accepts
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// (1) the chain state database
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// (2) the processed staking parameters
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// the function can then be called through the EVM context
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func CreateValidatorFn(ref *block.Header, chain ChainContext) vm.CreateValidatorFunc {
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// moved from state_transition.go to here, with some modifications
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return func(db vm.StateDB, rosettaTracer vm.RosettaTracer, createValidator *stakingTypes.CreateValidator) error {
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wrapper, err := VerifyAndCreateValidatorFromMsg(
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db, chain, ref.Epoch(), ref.Number(), createValidator,
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)
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if err != nil {
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return err
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}
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if err := db.UpdateValidatorWrapper(wrapper.Address, wrapper); err != nil {
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return err
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}
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db.SetValidatorFlag(createValidator.ValidatorAddress)
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db.SubBalance(createValidator.ValidatorAddress, createValidator.Amount)
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//add rosetta log
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if rosettaTracer != nil {
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rosettaTracer.AddRosettaLog(
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vm.CALL,
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&vm.RosettaLogAddressItem{
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Account: &createValidator.ValidatorAddress,
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},
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&vm.RosettaLogAddressItem{
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Account: &createValidator.ValidatorAddress,
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SubAccount: &createValidator.ValidatorAddress,
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Metadata: map[string]interface{}{"type": "delegation"},
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},
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createValidator.Amount,
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)
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}
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return nil
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}
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}
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func EditValidatorFn(ref *block.Header, chain ChainContext) vm.EditValidatorFunc {
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// moved from state_transition.go to here, with some modifications
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return func(db vm.StateDB, rosettaTracer vm.RosettaTracer, editValidator *stakingTypes.EditValidator) error {
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wrapper, err := VerifyAndEditValidatorFromMsg(
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db, chain, ref.Epoch(), ref.Number(), editValidator,
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)
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if err != nil {
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return err
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}
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return db.UpdateValidatorWrapper(wrapper.Address, wrapper)
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}
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}
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func DelegateFn(ref *block.Header, chain ChainContext) vm.DelegateFunc {
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// moved from state_transition.go to here, with some modifications
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return func(db vm.StateDB, rosettaTracer vm.RosettaTracer, delegate *stakingTypes.Delegate) error {
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delegations, err := chain.ReadDelegationsByDelegatorAt(delegate.DelegatorAddress, big.NewInt(0).Sub(ref.Number(), big.NewInt(1)))
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if err != nil {
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return err
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}
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updatedValidatorWrappers, balanceToBeDeducted, fromLockedTokens, err := VerifyAndDelegateFromMsg(
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db, ref.Epoch(), delegate, delegations, chain.Config())
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if err != nil {
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return err
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}
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for _, wrapper := range updatedValidatorWrappers {
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if err := db.UpdateValidatorWrapperWithRevert(wrapper.Address, wrapper); err != nil {
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return err
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}
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}
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db.SubBalance(delegate.DelegatorAddress, balanceToBeDeducted)
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if rosettaTracer != nil && balanceToBeDeducted != big.NewInt(0) {
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//add rosetta log
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rosettaTracer.AddRosettaLog(
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vm.CALL,
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&vm.RosettaLogAddressItem{
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Account: &delegate.DelegatorAddress,
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},
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&vm.RosettaLogAddressItem{
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Account: &delegate.DelegatorAddress,
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SubAccount: &delegate.ValidatorAddress,
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Metadata: map[string]interface{}{"type": "delegation"},
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},
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balanceToBeDeducted,
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)
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}
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if len(fromLockedTokens) > 0 {
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sortedKeys := []common.Address{}
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for key := range fromLockedTokens {
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sortedKeys = append(sortedKeys, key)
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}
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sort.SliceStable(sortedKeys, func(i, j int) bool {
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return bytes.Compare(sortedKeys[i][:], sortedKeys[j][:]) < 0
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})
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// Add log if everything is good
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for _, key := range sortedKeys {
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redelegatedToken, ok := fromLockedTokens[key]
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if !ok {
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return errors.New("Key missing for delegation receipt")
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}
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encodedRedelegationData := []byte{}
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addrBytes := key.Bytes()
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encodedRedelegationData = append(encodedRedelegationData, addrBytes...)
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encodedRedelegationData = append(encodedRedelegationData, redelegatedToken.Bytes()...)
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// The data field format is:
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// [first 20 bytes]: Validator address from which the locked token is used for redelegation.
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// [rest of the bytes]: the bigInt serialized bytes for the token amount.
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db.AddLog(&types.Log{
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Address: delegate.DelegatorAddress,
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Topics: []common.Hash{staking.DelegateTopic},
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Data: encodedRedelegationData,
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BlockNumber: ref.Number().Uint64(),
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})
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//add rosetta log
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if rosettaTracer != nil {
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// copy from address
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fromAccount := common.BytesToAddress(key.Bytes())
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rosettaTracer.AddRosettaLog(
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vm.CALL,
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&vm.RosettaLogAddressItem{
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Account: &delegate.DelegatorAddress,
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SubAccount: &fromAccount,
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Metadata: map[string]interface{}{"type": "undelegation"},
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},
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&vm.RosettaLogAddressItem{
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Account: &delegate.DelegatorAddress,
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SubAccount: &delegate.ValidatorAddress,
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Metadata: map[string]interface{}{"type": "delegation"},
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},
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redelegatedToken,
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)
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}
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}
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}
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return nil
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}
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}
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func UndelegateFn(ref *block.Header, chain ChainContext) vm.UndelegateFunc {
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// moved from state_transition.go to here, with some modifications
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return func(db vm.StateDB, rosettaTracer vm.RosettaTracer, undelegate *stakingTypes.Undelegate) error {
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wrapper, err := VerifyAndUndelegateFromMsg(db, ref.Epoch(), undelegate)
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if err != nil {
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return err
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}
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//add rosetta log
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if rosettaTracer != nil {
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rosettaTracer.AddRosettaLog(
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vm.CALL,
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&vm.RosettaLogAddressItem{
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Account: &undelegate.DelegatorAddress,
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SubAccount: &undelegate.ValidatorAddress,
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Metadata: map[string]interface{}{"type": "delegation"},
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},
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&vm.RosettaLogAddressItem{
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Account: &undelegate.DelegatorAddress,
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SubAccount: &undelegate.ValidatorAddress,
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Metadata: map[string]interface{}{"type": "undelegation"},
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},
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undelegate.Amount,
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)
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}
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return db.UpdateValidatorWrapperWithRevert(wrapper.Address, wrapper)
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}
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}
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func CollectRewardsFn(ref *block.Header, chain ChainContext) vm.CollectRewardsFunc {
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return func(db vm.StateDB, rosettaTracer vm.RosettaTracer, collectRewards *stakingTypes.CollectRewards) error {
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if chain == nil {
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return errors.New("[CollectRewards] No chain context provided")
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}
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delegations, err := chain.ReadDelegationsByDelegatorAt(collectRewards.DelegatorAddress, big.NewInt(0).Sub(ref.Number(), big.NewInt(1)))
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if err != nil {
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return err
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}
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updatedValidatorWrappers, totalRewards, err := VerifyAndCollectRewardsFromDelegation(
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db, delegations,
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)
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if err != nil {
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return err
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}
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for _, wrapper := range updatedValidatorWrappers {
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if err := db.UpdateValidatorWrapperWithRevert(wrapper.Address, wrapper); err != nil {
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return err
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}
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}
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db.AddBalance(collectRewards.DelegatorAddress, totalRewards)
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// Add log if everything is good
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db.AddLog(&types.Log{
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Address: collectRewards.DelegatorAddress,
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Topics: []common.Hash{staking.CollectRewardsTopic},
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Data: totalRewards.Bytes(),
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BlockNumber: ref.Number().Uint64(),
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})
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//add rosetta log
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if rosettaTracer != nil {
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rosettaTracer.AddRosettaLog(
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vm.CALL,
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nil,
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&vm.RosettaLogAddressItem{
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Account: &collectRewards.DelegatorAddress,
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},
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totalRewards,
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)
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}
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return nil
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}
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}
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//func MigrateDelegationsFn(ref *block.Header, chain ChainContext) vm.MigrateDelegationsFunc {
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// return func(db vm.StateDB, migrationMsg *stakingTypes.MigrationMsg) ([]interface{}, error) {
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// // get existing delegations
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// fromDelegations, err := chain.ReadDelegationsByDelegator(migrationMsg.From)
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// if err != nil {
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// return nil, err
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// }
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// // get list of modified wrappers
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// wrappers, delegates, err := VerifyAndMigrateFromMsg(db, migrationMsg, fromDelegations)
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// if err != nil {
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// return nil, err
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// }
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// // add to state db
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// for _, wrapper := range wrappers {
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// if err := db.UpdateValidatorWrapperWithRevert(wrapper.Address, wrapper); err != nil {
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// return nil, err
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// }
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// }
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// return delegates, nil
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// }
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//}
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// calculate the gas for migration; no checks done here similar to other functions
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// the checks are handled by staking_verifier.go, ex, if you try to delegate to an address
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// who is not a validator - you will be charged all gas passed in two steps
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// - 22k initially when gas is calculated
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// - remainder when the tx inevitably is a no-op
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// i have followed the same logic here, this only produces an error if can't read from db
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func CalculateMigrationGasFn(chain ChainContext) vm.CalculateMigrationGasFunc {
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return func(db vm.StateDB, migrationMsg *stakingTypes.MigrationMsg, homestead bool, istanbul bool) (uint64, error) {
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var gas uint64 = 0
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delegations, err := chain.ReadDelegationsByDelegator(migrationMsg.From)
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if err != nil {
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return 0, err
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}
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for i := range delegations {
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delegationIndex := &delegations[i]
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wrapper, err := db.ValidatorWrapper(delegationIndex.ValidatorAddress, true, false)
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if err != nil {
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return 0, err
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}
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if uint64(len(wrapper.Delegations)) <= delegationIndex.Index {
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utils.Logger().Warn().
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Str("validator", delegationIndex.ValidatorAddress.String()).
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Uint64("delegation index", delegationIndex.Index).
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Int("delegations length", len(wrapper.Delegations)).
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Msg("Delegation index out of bound")
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return 0, errors.New("Delegation index out of bound")
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}
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foundDelegation := &wrapper.Delegations[delegationIndex.Index]
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// no need to migrate if amount and undelegations are 0
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if foundDelegation.Amount.Cmp(common.Big0) == 0 && len(foundDelegation.Undelegations) == 0 {
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continue
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}
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delegate := stakingTypes.Delegate{
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DelegatorAddress: migrationMsg.From,
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ValidatorAddress: delegationIndex.ValidatorAddress,
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Amount: foundDelegation.Amount,
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}
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encoded, err := rlp.EncodeToBytes(delegate)
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if err != nil {
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return 0, err
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}
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thisGas, err := vm.IntrinsicGas(
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encoded,
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false,
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homestead,
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istanbul,
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false, // isValidatorCreation
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)
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if err != nil {
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return 0, err
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}
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// overflow when gas + thisGas > Math.MaxUint64
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// or Math.MaxUint64 < gas + thisGas
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// or Math.MaxUint64 - gas < thisGas
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if (math.MaxUint64 - gas) < thisGas {
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return 0, vm.ErrOutOfGas
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}
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gas += thisGas
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}
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if gas != 0 {
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return gas, nil
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} else {
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// base gas fee if nothing to do, for example, when
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// there are no delegations to migrate
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return vm.IntrinsicGas(
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[]byte{},
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false,
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homestead,
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istanbul,
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false, // isValidatorCreation
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)
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}
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}
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}
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// GetHashFn returns a GetHashFunc which retrieves header hashes by number
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func GetHashFn(ref *block.Header, chain ChainContext) func(n uint64) common.Hash {
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var cache map[uint64]common.Hash
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return func(n uint64) common.Hash {
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// If there's no hash cache yet, make one
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if cache == nil {
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cache = map[uint64]common.Hash{
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ref.Number().Uint64() - 1: ref.ParentHash(),
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}
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}
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// Try to fulfill the request from the cache
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if hash, ok := cache[n]; ok {
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return hash
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}
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// Not cached, iterate the blocks and cache the hashes
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for header := chain.GetHeader(ref.ParentHash(), ref.Number().Uint64()-1); header != nil; header = chain.GetHeader(header.ParentHash(), header.Number().Uint64()-1) {
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cache[header.Number().Uint64()-1] = header.ParentHash()
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if n == header.Number().Uint64()-1 {
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return header.ParentHash()
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}
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}
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return common.Hash{}
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}
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}
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// GetVRFFn returns a GetVRFFn which retrieves header vrf by number
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func GetVRFFn(ref *block.Header, chain ChainContext) func(n uint64) common.Hash {
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var cache map[uint64]common.Hash
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return func(n uint64) common.Hash {
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// If there's no hash cache yet, make one
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if cache == nil {
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curVRF := common.Hash{}
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if len(ref.Vrf()) >= 32 {
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vrfAndProof := ref.Vrf()
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copy(curVRF[:], vrfAndProof[:32])
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}
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cache = map[uint64]common.Hash{
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ref.Number().Uint64(): curVRF,
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}
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}
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// Try to fulfill the request from the cache
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if hash, ok := cache[n]; ok {
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return hash
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}
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// Not cached, iterate the blocks and cache the hashes
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for header := chain.GetHeader(ref.ParentHash(), ref.Number().Uint64()-1); header != nil; header = chain.GetHeader(header.ParentHash(), header.Number().Uint64()-1) {
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curVRF := common.Hash{}
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if len(header.Vrf()) >= 32 {
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vrfAndProof := header.Vrf()
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copy(curVRF[:], vrfAndProof[:32])
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}
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cache[header.Number().Uint64()] = curVRF
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if n == header.Number().Uint64() {
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return curVRF
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}
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}
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return common.Hash{}
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}
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}
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// CanTransfer checks whether there are enough funds in the address' account to make a transfer.
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// This does not take the necessary gas in to account to make the transfer valid.
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func CanTransfer(db vm.StateDB, addr common.Address, amount *big.Int) bool {
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return db.GetBalance(addr).Cmp(amount) >= 0
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}
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// IsValidator determines whether it is a validator address or not
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func IsValidator(db vm.StateDB, addr common.Address) bool {
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return db.IsValidator(addr)
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}
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|
|
|
// Transfer subtracts amount from sender and adds amount to recipient using the given Db
|
|
func Transfer(db vm.StateDB, sender, recipient common.Address, amount *big.Int, txType types.TransactionType) {
|
|
if txType == types.SameShardTx || txType == types.SubtractionOnly {
|
|
db.SubBalance(sender, amount)
|
|
}
|
|
if txType == types.SameShardTx {
|
|
db.AddBalance(recipient, amount)
|
|
}
|
|
}
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|
|